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US 2016/0243931 A1Published application
Fuel tank pressure sensor rationality for a hybrid vehicle during refueling
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
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Abstract
Methods and systems are provided for performing fuel tank pressure sensor rationality for a hybrid electric vehicle during refueling. In one example, a method may include indicating degradation of the fuel tank pressure sensor based on the pressure detected in the canister vent line when the canister vent line is restricted.
Claims20
A method for a fuel emissions system of a hybrid vehicle, comprising:
- during a refueling event, maintaining a fuel vapor canister vent line restriction;
- and
- indicating degradation of a fuel tank pressure sensor based on a pressure in the canister vent line.
A system for a hybrid-electric vehicle, comprising:
- a fuel tank isolation valve coupled in a conduit between a fuel tank and a fuel vapor canister;
- a fuel tank pressure sensor;
- an evaporative leak check module (ELCM) coupled in a conduit between the fuel vapor canister and atmosphere, the ELCM comprising a vacuum pump, an ELCM pressure sensor, and a change-over valve operable between a first position and a second position;
- and
- a controller configured with instructions stored in non-transitory memory that when executed cause the controller to:
- during refueling of the fuel tank, perform an evaporative leak check routine by:
- adjusting the change-over valve to the first position;
- and
- comparing fuel tank pressure sensor output and ELCM pressure sensor output and indicating degradation of the fuel tank pressure sensor when a rate of change of the fuel tank pressure sensor output is lower than the a rate of change of the ELCM pressure sensor output by at least a threshold amount.
6 more elements
A method, comprising:
- responsive to a request to perform a fuel tank refuel, determining if fuel tank pressure is equal to atmospheric pressure;
- if fuel tank pressure is not equal to atmospheric pressure, indicating degradation of a fuel tank pressure sensor based on a correlation between fuel tank pressure sensor output and canister vent line pressure during fuel tank depressurization prior to the fuel tank refuel;
- and
- if fuel tank pressure is equal to atmospheric pressure, indicating degradation of the fuel tank pressure sensor based on a correlation between fuel tank pressure sensor output and canister vent line pressure during the fuel tank refuel.
1 more element
Dependencies are inferred from the claim text.